Pipe-suspending device and blow-out preventer for oil-well cas



March 30, 1926. 1,579,144

F. REDICK PIPE SUSPENDING DEVICE AND BLOW-OUT PREVENTERFOR OIL WELL CASINGS Filed Oct. 5, 1925 3 Sheets-Sheet l 6 mvE'NToR WITNESS:

ATI'OR N EY March 30,1926. 1,579,144 F. REDICK' PIPE SUSPENDING DEVICE AND BLOW-OUT PREVENTER FOR'QIL WELL CASINGS Filed 0012. 5,11925 3 Sheets-Sheet 2 J%.Z. g

ATTORN EY WITNESS:

March 30 1926.

, F. REDICK PIPE SUSPENDING DEVICE AND BLOW-OUT PREVENTER FOR OIL WELL CASINGS' 3 Sheets-Sheet 5 Filed Oct, 5, 1925 INVENTOR ATTOR N EY WITNESS:

'55 2 of a bushi Patented Mar. 30, 1926.

UNITED STATES PATENT OFFIJCE.

"FRANK REDICK, OF IPARKERTON, WYOMING.

PIIE-SUSPENDING DEVICE AND BLOW-OUT PREVENTER FOR OIL-WELL CAST.

Application filed October 3, 1925? Serial No. 60,299. v

1 My present invention has reference to a new and novel means for-hanging or sus pending long strings of pipes in oil wells, as well as for controlling the outflow of gas and water which may flow between any two strings of pipes and for preventing blow Patent- No. 1,523,897, but the said bushings outs between the strings of pipes.

A further object is to simplify and improve the construction disclosed-by U. S. Letters-Patent, No. 1,523,897, granted me on January 20, 1925.

a In the drawings:

Figure 1 i provement with parts in section.

Figure 2 is a similar view showing one of the bushings elevatedabove the adjacent bushing, and thenipple'connecting one of 1 the strings of 'pipe raised prior to having the elevated bushing screwed thereon.

Figure 3 is a sectional view on the line 3 33 of Figure 1.

Figure 4 is an approximately central transverse sectional view showing all of the .pipes suspended and supported in accordance with this invention.

Except in certain 'novel features of con struction and important functions performed thereby, my, present invention is very similar to the construction disclosed by the U. S. Patent No. 1,523,897, granted me on January 20, 1925. Therefore, features dis- 7 closed by my said patent, which are illustrated by my present drawings, will be only briefly referred to. I u i A crane or derrick carrying chain hooks is employed for engaging the ears of the bushings and for raising and lowering the strings of pipe casing in a manner and for a purpose which will be presently and fully set forth.

In Figure 1 of the drawings the A designates a suitable foundation, of cement or other material. Resting on this foundation there is a metal base 1, and resting on the base 1 there is the enlarged outer end or the head The bushin -i s p iovided with a cylindrical depending y portion a side elevation of the im-' 3 that isreceived through a central opening in the base 1, the foundation being provided with an opening that aligns with the openmg in the base.

As disclosed by the drawings any desired number of bushings are employed, one resting on the other and the body portion 3 of the superimposed bushings being received.

through the head portions of the bushings.

Of course, the bushings gradually decrease 'in cross sectional diameter and all of the bushings have hydralilic packings thereb tween to insure both water and gas tig t joints. The bushings are substantially siniilar to those disclosed in my referred to said heads of the bushings hax e continuous grooves, for the hydraulic packings; The confronting faces of the bushing heads have ears 4 arranged at angles of approximately 90 and through which ears there are passed bolts 5 which are engaged by nuts- 6 for compressing the packings between the bushings to prevent high gas pressure from lift ing the bushings apart and allowing oilor gass to pass therebetween.

Each of the bushings has the bore of its body portion slightly flared inwardly, and threaded, and these threaded bores are designed to have screwed therein special collars 7 which form an important element of the improvement. These collars, however,

are not screwed, in the bushings until the,

pipe sections constituting the casings are arranged in the well, as will presently be understood. The bore of each collar is preferably flared outwardly from the center to the ends thereof, and these flared or conicalbores, are threaded for the engagement of pipe members 8'that form the upper sections of the well casing, and likewise for threaded engagement with a removable casing section which is in the drawings, indicated by the numeral 9. When the well casings are lowered in the well until the bottom of the well is reached, a casing section 8 is cut the proper length and. screwed on the upper joint of the casing proper. It is cu'stomaryto allow a certain amount of tension on each string of long pipeconstituting the casing, as for instance say 3500 feet of 8 inch casing pipe should ave app imat ly fr m 1 to 18 III inches of stretch before it would lift the bottom joint off the bottom of the hole. It is usually desirable to hang from one-half to two-thirds of the weight of this string on the casing suspending device, which, in this instance, comprises the bushing. Consequently from ten to twelve inches of stretch as it is commonly called, is taken on the casing. In other words, the pipe or casing section 8 is cut so that whenit is screwed onto the casing pipe already in the hole it will lack from ten to twelve inches of reaching the proper height. In hanging it up, the casing section 8 is cut the right length to allow for the tension. The specially threaded collar 7 is then screwed onto the casing or pipe section 8. This is. facilitated by the arrangement of the flared threaded bore and the flared threaded end of the casing 8. A bushing 2 has then passed therethrough the outer pipe or casing section 9. The pipe or casing section 9 is suspended from the derrick which is also operated to elevate the same to raise the easing section 8 to its first mentioned position. The short pipe or casing section 9 is lowered with the easing into the well until the said casing reaches the bottom and the casing section 8 is screwed up tight to the upper joint of the casing proper. Tension is then taken off of the string of easing by raising the short pipe or casing section 9 (see Figure 2). This also raises one of the bushings 2 off of the bushing immediately beneath it. The raised bushing is screwed on the specially threaded collar 7 and is then lowered until it rests on the next bushing. The bolts 5 are then passed through the ears 4 of the adja cent bushings and the nuts 6 are screwed home on the bolts. The short pipe or casing section 9 is unscrewed from the specially threaded collar and this method is repeated until all of the strings of easing are properly arranged in the well. The lower bushing is bolted onto the base, and, of course, the string of casingssupported from the said lower bushing are connected thereto and suspended therefrom in a manner as above described.

The construction and advantages of my improvement will, it is thought, be perfectly apparent to those skilled in the art to which such invention relates when the foregoing description is read in connection with the accompanying drawings. I do not, however, desire being restricted to the precise construction herein set forth and may make such changes therefrom as fall within the scope of what I claim.

Having described the invention, I claim: 1. The combination of a base member arranged over a well and interfitting superimposed bushings on the base, and well casings designed to be suspended from the bushings, each of said casings having its outer pipe section cut and threaded, an interiorly and exteriorly threaded special collar screwed on the said casing section, an outer casing section removably screwed in the collar whereby the casing to which the collar is connected may be raised or lowered into the well and also whereby the special collar may be threaded into a bushing, and the last mentioned casing section thereafter removed from the said outer casing section.

2. The combination with a pipe casinglet in a well and a base member arranged over and surrounding the casing, of superimposed bushings, resting on the base, each of said bushings including a head and a reduced body which is received in the head of the adjacent bushing, a specially threaded collar designed to be screwed in the bottom of each of said bushings, said special collar being threaded internally and externally, and designed to have screwed therein a casing section which is threadedly connected to the casing in the well, and each of said specially constructed couplings designed to have removably screwed therein a pipe member which is freely movable through the bushing through which it passes, said pipe member providing a means for raising or lowering the connected casing sections and to permit of the specially constructed coupling being screwed into the body of the bushings prior to the arrangement of the said bushing upon the next lower bushings.

In testimony whereof I afiix my signature.

FRANK REDICK. 

